Another guess my SB 340 et 1/4 mile :)

Yah we are having tons of trouble with vacume and running stupidly rich!!!! We were almost ready to drill holes in the throttle butterfly plates. Changed power valve. Looked everywhere for vacume leaks. (When I turn idle mix screws all the way in. Engine Dosent die). Idle from park to drive was big drop and seem to have mind of its own.
We've tried the intital timing at many diffent degrees with the same outcome. This cam is rumored to love lots of intial timing.
Was only pulling 5-7" vacume at 1000 rpm. Total from 34-36.
Must admit have not changed stock distributer yet. :s that's getting changed very soon
Once new converter is in gonna get my engine builders expert in to dial her in.

I'm still learning lots about getting her dialed in and that's what's great about this site and all you guys. So bare with me if I'm all over the place.

I've had a couple old mopars before but both very mild small blocks. And This is my first time with more radical cam, stall ect. So I got a lot more to learn.

If you have any ideas where I should plant the initial timing please post our thoughts.